package com.dhnsoft.education.controller.userCenter;

import com.dhnsoft.education.entity.userCenter.UcenterMember;
import com.dhnsoft.education.handle.EduException;
import com.dhnsoft.education.service.userCenter.UcenterMemberService;
import com.dhnsoft.education.utils.JwtUtils;
import com.dhnsoft.education.utils.userCenter.ConstantWxUtils;
import com.dhnsoft.education.utils.userCenter.HttpClientUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @Description
 * @ClassName WxApiController
 * @Author dhn
 * @date 2022.04.08 22:51
 */
@Controller
@RequestMapping("/api/ucenter/wx")
//@CrossOrigin
public class WxApiController {
    @Autowired
    private UcenterMemberService memberService;

    //1.生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode(){
        //固定地址，后面拼参数
        String baseUrl ="https://open.weixin.qq.com/connect/qrconnect"
                +"?appid=%s"
                +"&redirect_uri=%s"
                +"&response_type=code"
                +"&scope=snsapi_login"
                +"&state=%s"
                +"#wechat_redirect";
        //对redirect_url进行URLEncoder编码
        String redirect_url = ConstantWxUtils.WX_REDIRECT_URL;
        try {
            redirect_url = URLEncoder.encode(redirect_url,"utf-8");
        }catch (Exception e){
            e.printStackTrace();
        }
        //使用占位符来拼接
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_APP_ID,
                redirect_url,
                "dhnsoft"
        );
        //重定向到请求微信地址里面
        return "redirect:"+url;
    }

    //2.获取扫描人信息，添加数据,测试使用
    @GetMapping("callback")
    public String callback(String code,String state){
//        System.out.println("code:"+code+"   state:"+state);
        try {
            //1.获取code值，临时票据，类似于验证码
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个值: id，秘钥，code
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_APP_ID,
                    ConstantWxUtils.WX_APP_SECRET,
                    code
            );
            //2.拿着code请求，微信固定的地址，得到两个值 access_token 和openid
            //使用httpClient发送请求，得到返回结果
            String acccessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            //从acccessTokenInfo字符串中获取出来两个值 access_token 和 openid
            //把acccessTokenInfo字符串转换成map集合
            //使用json转换工具 Gson
            Gson gson = new Gson();
            //第一个参数是要转换的值，第二个参数是要转换的类型
            HashMap mapAccessToken = gson.fromJson(acccessTokenInfo, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");

            //把扫描人信息添加到数据库里
            //判断数据表里面是否存在相同微信信息,根据openid判断
            UcenterMember member = memberService.getOpenIdMember(openid);
            if(member == null){
                //3 拿着得到的access_token 和openid，再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户对象
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname");//昵称
                String headImgUrl = (String) userInfoMap.get("headimgurl");//头像
                member = new UcenterMember();
                member.setNickname(nickname);
                member.setAvatar(headImgUrl);
                member.setOpenid(openid);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面，通过路径传递token字符串
            return "redirect:http://114.55.238.50/?token="+jwtToken;
        }catch (Exception e){
            throw new EduException(20001,"登录失败");
        }

    }
}
